package com.lagou.config;

import com.lagou.io.Resources;
import com.lagou.pojo.Configuration;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;


import java.beans.PropertyVetoException;
import java.io.InputStream;
import java.util.List;
import java.util.Properties;

public class XmlConfigBuilder {
    private Configuration configuration;

    public XmlConfigBuilder() {
        this.configuration =new Configuration();
    }

    public Configuration parseConfig(InputStream inputStream) throws PropertyVetoException, DocumentException {
        Document document =new SAXReader().read(inputStream);

        Element rootElement =document.getRootElement();
        List<Element> list =rootElement.selectNodes("//property");
        Properties properties =new Properties();
        for(Element element:list){
            String name =element.attributeValue("name");
            String value =element.attributeValue("value");
            properties.setProperty(name,value);
        }
        ComboPooledDataSource comboPooledDataSource =new ComboPooledDataSource();
        comboPooledDataSource.setDriverClass(properties.getProperty("driverClass"));
        comboPooledDataSource.setJdbcUrl(properties.getProperty("jdbcUrl"));
        comboPooledDataSource.setUser(properties.getProperty("username"));
        comboPooledDataSource.setPassword(properties.getProperty("password"));
        configuration.setDataSource(comboPooledDataSource);

        List<Element> mapperList =rootElement.selectNodes("//mapper");
        for(Element element:mapperList){
            String mapperPath =element.attributeValue("resource");
            InputStream resourceAsStream =Resources.getResourceAsStream(mapperPath);
            XMLMapperBuilder xmlMapperBuilder =new XMLMapperBuilder(configuration);
            xmlMapperBuilder.parse(resourceAsStream);
        }

        return configuration;
    }
}
